Application of power to reciprocating-bed printing-presses.



R. MIEHLE.

APPLICATION OF POWER RECIPROCATING BED PRINTING PRESSES.

APPLICATION FILED SEPT. 5,1911.

Patented June 15, 1915.

2 SHEETS-SHEET I.

1 II I lNI/ENTOR R. MIEHLE.

APPLICATION OF POWER TO REGIPROCATING BED PRINTING PRESSES.

APPLICATION FILED SEPT. 5. 191 1.

1,143,425. Patented June 15, 1915.

\l' l' liiii II ml ul /lll/ll/l W/TNESSES: VIINVENTOR W71? MJ W M ZO.M.

MIEHLE, OF CHICAGO, ILLINOIS,'ASSIGNOR TO CONTINENTAL &: COMMERCIAL TRUST & SAVINGS BANK, TRUSTEE, OF CHICAGO, ILLINOIS.

' APPLIOA TION OFZPOWEB TO RECIPROCATING-BED PRINTING-P31288138.

' Specification of Letters Patent.

Patented J tine-15, 1915.

Application filed September 5, 1911. Serial No. 647,584.

To all whom it may concern.

Be it known that I, ROBERT Mnninn, a citizen of the United States, and a resident ofGhicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in the Application of Power to Reciprocating Bed Printing- Presses, of which the following is a specification.

This invention relates to improvements in reciprocating bed printing, presses, and has for its object-the controlling of the speed of the press by controlling the application of power thereto according to the requirements conducive to obtaining the greatest speed.

In this class of printing presses a bed motion mechanism having a crank is used to slow down, stop, and start the type bed at the end of each stroke. Air cushions are used in conjunction with the crank mechanism to assist in stopping the type bed at the end of each stroke. However there is a limit to the speed of the press on account of the shock produced by the stopping of the type bed, when running. over a certain limit of speed, which is very detrimental to the bed motion mechanism.

The object of this invention is to apply the motive power so that the type bed will receive a variable speed, which will have the maximum speed at the middle of the stroke of the type bed and a minimumspeed at the ends of the stroke. By reducing the speed: at the ends of the stroke the momentum of the type bed is diminished and it permits the press being run at a higher rate of speed before the limit of the speed of the press is reached, when the shock at the ends of the stroke is detrimental to the bed motion mechanism.

The invention also consists in the special forms of automatic mechanism herein set forth.

The nature of the invention will be more fully understood from the subjoined description and the accompanying drawings which form a part of this specification.

In said drawing Figure l is an end view of a reciprocating bed printing press equipped with the motor controlling mechanism. Fig. 2 is a partial left side view in elevation of the same. Fig. 3 is a left side view in elevation of the same, having the side frame removed in order to show the interior bed motion mechanism. FigJfk shows a modified form of the invention. Fig. 5

shows another modification of the inven-= tion Fig. 6 IS a detail sectional view illustrating means for shifting the field magnet.

relatively to the rotatable armature to vary the speed of themotor.

In said drawings, 1

is the electric motor from which the power is transmitted through the pulley, 2, and" belt, 3,;to1the main drive pulley, t, wh1ch is mountedon. the main drive shaft, 5, of the press. 6 is an automatic controller.

7 is the controlling lever of the controller, 6, for varying the speed of the motor. Pivotally attached to the lever, 7, is the connecting rod tube, 14, and the rod, 8, which is in turn ivotally connected to the pression cylinder shaft, 9, by thecrank stud,

10. This stud is mounted,eccentrically on said shaft.

'21 is the regular motor controller, which is used 'by the operator to start the motoi and press. To start the motor the lever, 22, is shifted to a position, which will give the press the proper speed desired. I

By loosening the clamp screw, 13, the rod, 8, can be made shorter or longer byv sliding Referring to the mechanism for driving the bed, I do not restrict my invention to any particular mechanism, as any mechanism may be substituted for driving the bed. In the drawings the bed 12 is provided on its under side with. racks, C, C, which are engaged driving pinion,

its uniform to and fro motion andis journaled on the outer end ofythe oscillating arm I, which is raised and lowered at proper times by the cam 2', on shaft N, which has on its outer end a gear F, which receives mo tion from pinion J on shaft 5. The gear D carries a wrist-pin or crank stud E, upon which is a roller E, which is adapted to en gage with one of the end slots E (see Fig. l) formed between the end bars A, and the gates A which are hinged to the press bed and swung on vertical axes.v When the bed reaches the end ofeach stroke, and wh le alternately by a bed which gives to the bed pinionD is out of mesh with both racks, the roller E moves through .the slot E and reverses the bed by slowing down, stopping, and starting it in the reverse direction, during which period the pinion D is shifted from position to engage one rack into position to engage the other. The air cylinders Gr are fixed to the press frame and the air pistons H are fixed to the type bed. These air cushions assist in stopping the type bed and help to start it back on its return stroke. The gates A are swung in and out of the path of the roller E by the studs A working in the cam grooves Ah.

As the gear D reaches the end of each rack, the roller E is in position for en gagement with one of the slots E said roller E bearing against the adjacent end bar A and being at either its extreme up or down position according to which reversal is about to be accomplished. Just before the gear D is disengaged from the rack the adjacent gate A, by the-operation of the stud A in the cam groove A swings into the path of Qsaid roller E, thus engaging said roller with the press bed. While thus I engaged said roller E slows down, stops,

the engagement of said gear and reverses the press bed pJreparatOry to with the opposite rack. Just as the gear D is engaged with said opposite'rack by the action of said cam 2' the gate A is swung out of the path of the roller E, thus freeing it from engagement with the press bed and gear D 35 then propels said press bed through the engaged rack to the other reversal of said bed, where the above mentioned operation is repeated in the opposite slot E In the cycle of operation of the press the gear D and roller E receive three complete revolutions, one while gear D is engaged in each rack and one half a revolution while roller E is engaged in each slot. The impression cylinder in this form of press, when operating, makes two complete revolutions for each complete reciprocation of the type bed.

' Asthe impression cylinder revolves the stud 10 revolves with it, raising and lowering the .rod 8, which transmits this motionto the lever 7, thereby moving the finger 7 over the speed points 6, so as to change the speed of the motor. The action of the stud 10 is so timed that the speed of the bed is gradually increased from the beginning of the stroke until at the middle of the stroke it has reached its maximum speed/ From this point the speed is gradually decreased until at the end of the stroke the minimum speed is reached. From this it will be readily understood that as the wrist-pin or crank stud comes into action tostop the bed the momentum of the bed is not as it would be if the speed of the bed had not been decreased by-decreasing the speed of the motor as above referred to. Consequently by running the press at the oints of reversal of the type bed at a spec which is not detrimental to the bed motion mechanism, and increasing this speed during the stroke of the type bed a greater speed is obtained than byrunning the press uniformly at a speed, which is not detrimental to the bed motion mechanism at the points of reversal.

Fig. 4c shows the invention as applied to a shifting armature type motor. The crank, 15, is fixed to the impression cylinder shaft, 9. Pivotally connected to the outer end of this crank is the rod, 16, at the outer end of which is fixed the rack, 17. Supporting this rack is the slide, 18, which is pivotally su ported by the shaft, 19. Solidly fixed to t e shaft, 19, is the gear, 20, which meshes with the rack, 17. As indicated in Figs. 4 and 6, the shaft 19 may be threaded and engage a. threaded lug on the field magnet 200 of an electrical motor so that by turning shaft 19 the position of this field magnet relative to the armature. 201 can be varied, thereby regulating or varying the speed of the motor. By revolving the shaft, 19, one'way the armature is shifted and the speed of the motor is increasedyand by revolving it in the opposite direction. the speed of the motor is decreased. Thus, as the impressioncylinder, 11, revolves, the crank, 15, revolves with it and through rod, 16, oscillates the rack, 17, which in turn oscillates the gear, 20, and shaft, 19, thereby varying the speed of the motor. I

The control device shown in Fig. 4' is adapted to vary the speed of the motor by varying the strength of the magnetic in-= fluence that the field magnets of the motor exert upon the armature. The principle of operation being, that the influence that the magnetic field exerts upon the armature varies inversely as the length and directly as the area of the air gap between the armature and the field magnets. The armature and the inside surface of the field magnets are given a slight taper representing surfaces of truncated cones one within the other with the shaft of the motor as axis. Any lateral movement of the armature or field magnets will therefore vary the air gap and consequently vary the magnetic influence that the field magnets exert upon the armature, thus causing a variation in the speed of the motor. The shaft 19 controls the lateral position of th'e'field magnets and armature with respect to one another, thus by revolving said shaft 19'the speed of the motor is varied.

A cam, 23, shown in Fig. 5, can be substituted for the crank, 15, or crank stud, 10, in which case the action of the rod, 16, or 8, can be varied, if desired, by forming the cam groove so as to give any desired motion to the controllin mechanism I Having thus fully. ascribed my. invention,

reciprocate said bed at a substantially uniform speed during the major portions of its strokes, such speed being substantially the same in both directions of movement of the bed and reversing its movements at the ends of its strokes with gradual speed retardation and gradual speed acceleration in the opposite direction, and an electric motor to actuate said bed-driving means and operating at an increasing speed from substantially the beginning of a bed stroke and at a decreasing speed upon the cessation of the increasing speed to substantially the end of the bed stroke, substantially as described.

2. In a printing-press, the combination of a reciprocatory bed, means adapted to reciprocate said bed at a substantially uniform speed during the major portions of its strokes, such speed being substantially the same in both directions of movement of the bed and reversing its movements at the ends of its strokes with gradual speed retardation and gradual speed acceleration in the opposite direction, an electric. motor to actuate said bed-driving means, and means operated by the movement of a part of the printingpress to increase the speed of the motor from substantially the beginning of a bed stroke and decreasing its speed upon the cessation of the increasing speed to substantially the end-of the bed stroke, substantially as described,

3. In a printing-press, the combination of a revoluble impression cylinder, means to revolve said cylinder, a reciprocatory bed, means adapted to reciprocate said bed at a substantially uniform speed during the maj or portions of its strokes, such speed being substantially the same in both directions of movement of the bed and reversing its movements at the ends of its strokes with gradual speed retardation and gradual speed acceleration in the opposite direction, and an electric motor to actuate said cylinderrevolving means and said bed-driving means and operating at an increasing speed from substantially the beginning of a bed stroke and at a decreasing speed upon the cessation of the increasing speed to substantially the end of the bed stroke, substantially as described.

t. In a printing-press, the combination of a revoluble impression cylinder, means to revolve said cylinder, a reciprocatory bed, means adapted to reciprocate said bed at a substantially uniform speed during the maj or portions of its strokes, such speed being substantially the same in both directions of movement of the bed and reversing its movements at the ends of its strokes with gradual speed retardation and gradual speed acceleration in the opposite direction, an electric motor for actuating said cylinderrevolving and bed-driving means, and means operated by a movement of a part of the press-mechanism to gradually increase the speed of the motor from substantially the beginning of the bed-stroke and to gradually decrease the motor speed upon the cessation of the increasing speed to substantially the end'of the bed stroke, substantially as described.

ROBERT MIEHLE. I

Witnesses:

RoBER'r F. MIEBLE, Jr., M. P1031211. 

